Alan Mintz wrote:
At 2010-12-19 00:59, Wyo wrote:
I've just realised that rather many nodes have their own source tag, even
if they are just part of a way with identical tag. So I guess a rather
large part of the data consists of these source tags. While this isn't a
problem for files (thanks to compression) it enlarges the database quite a bit.
Are these tags really necessary or could they be remove as long as the way
has a source tag? Could anybody provide an estimate how much space
reduction could be gained? Could anybody create a report on how many nodes
have identical tags as their way?
Do you have an example?
See http://www.openstreetmap.org/edit?lat=47.17473&lon=4.71559&zoom=17 where the
nodes of the canal way have identical values.
I tag intersections of ways as I survey them with source=*, source_ref=*
among other things, like signalling, turn restrictions, etc. Sometimes, the
source value is the same as that of the way, but that is only coincidental
- it's not a duplication.
Sorry I don't understand that. Since nodes obviously inherit (by understanding)
anything from their ways, the values either must be different to show different
info or they don't carry any info.
Wyo
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